Instead of having a boolean flag, we have a separate threadIsWithBlockedUserOnlyWithoutAdminRoleCheck function which skips the admin role check.

threadIsWithBlockedUserOnly takes LegacyRawThreadInfo | RawThreadInfo and goes through "traditional" admin role check
threadIsWithBlockedUserOnlyWithoutAdminRoleCheck takes only ThreadInfo and handles admin role check "before" via hook

Depends on D12293

flow + close reading